Fix a couple of Holmake tests

- In badincludes, the output being tested has changed to use an
absolute path instead of a relative path.
- In holdep, the dependency on the cmp.exe utility needs to be
explicitly mentioned (and this seems totally reasonable to me).
Previously, the system relied on the fact that it got built when the
INCLUDES was recursed into. Now Holmake won't build stuff in the
INCLUDES directories unless a target actually requires it.
- In testsrc, there is an analogous dependency on unicode-grep that
needs to be made explicit

Make a Holmake test build under Moscow ML

Proper version of c85433294

Still closes #572

Revert "Make Holmake report problems with INCLUDES/-I paths better"

This reverts commit c8543329459313ad015b9158e36841616d02d5e5.

My failed git skills around developing on multiple directories in
parallel dropped the previous commit.

Make Holmake report problems with INCLUDES/-I paths better

Closes #572